cc/python/deterministic_aead.clif

# Copyright 2019 Google LLC.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from "tink/python/util/clif.h" import *  # StatusOr

from "tink/cc/deterministic_aead.h":
  namespace `crypto::tink`:
    # Interface for Deterministic Authenticated Encryption with Associated Data
    # (Deterministic AEAD)
    #
    # For why this interface is desirable and some of its use cases, see for
    # example https://tools.ietf.org/html/rfc5297#section-1.3.
    #
    # Warning!
    # Unlike Aead, implementations of this interface are not semantically
    # secure, because encrypting the same plaintex always yields the same
    # ciphertext.
    #
    # Security guarantees
    #
    # Implementations of this interface provide 128-bit security level against
    # multi-user attacks with up to 2^32 keys. That means if an adversary
    # obtains 2^32 ciphertexts of the same message encrypted under 2^32 keys,
    # they need to do 2^128 computations to obtain a single key.
    #
    # Encryption with associated data ensures authenticity (who the sender is)
    # and integrity (the data has not been tampered with) of that data, but not
    # its secrecy. (see https://tools.ietf.org/html/rfc5116)
    class DeterministicAead:

      def `EncryptDeterministically` as encrypt_deterministically(
          self, plaintext: bytes, associated_data: bytes) -> StatusOr<bytes>
      def `DecryptDeterministically` as decrypt_deterministically(
          self, ciphertext: bytes, associated_data: bytes) -> StatusOr<bytes>